NAKUL SHAH. Analysis, design and experimental verification of a novel ac-ac buckboost based dynamic voltage regulator. (Under the direction of DR. MADHAVMANJREKAR)This thesis investigates a unique direct ac-ac converter based topology that can beused to shield the load from any disturbance occurring in the grid voltage. The proposedconverter topology uses disturbed source itself to synthesize required series compensationvoltage to restore the load voltage to its pre-defined amplitude and shape. Termed ACDynamic Voltage Regulator, offers advantages of smaller size, superior effectiveness andabsence of DC storage systems over conventional Dynamic Voltage Regulators.Moreover, because of its unique system architecture and control strategy, AC-DVR offersinstantaneous sinusoidal power extraction from the grid, irrespective of any disturbancethat is introduced in the grid voltage. The proposed topology, overall system architecture,operating principle and control are discussed thoroughly in this article. The behavior ofAC-DVR is evaluated against various grid voltage disturbances such as voltage sag,voltage swell, harmonics etc. and results are documented for each disturbance.Simulation results are presented for various disturbance scenarios to prove the efficacy ofthe proposed methodology. It is shown that the proposed AC-DVR is capable of shieldingload from almost any kind of disturbance that is occurring in grid voltage. Experimentalresults demonstrating the AC-AC Dynamic Voltage Regulation are also presented in thisarticle. A possible modification that can be made for proposed topology is also offeredand discussed. Simulation results supporting the behavior of proposed modificationagainst similar voltage disturbances are also discussed and documented.